Gear



Feb. 4, 1930. A. M. ALEXANDRESCU GEAR Filed Dec. 17, 1927 2 Sheets-Sheet l Whoa #Jfifllexamiresaw I 59 Feb. 4," 1930. I A. M. 'ALEXANDRESCU 1,746,178

- GEAR Filed Dec. 17, 1927 2 Sheets-Sheet 2 sm/mm 15. Mfllamndmww Pissed-rm,153g 1,746,178

max mum; simian- .5011, oi'oLuvErnND, oHio situ t on filed December '17,l 1927. 1 sear ng 240,763. r I Mypresentinventionrelates toimprove teeth a and Ii be hereinafter .ments in adjustable gears, andyitisintended described; 'x

toprovide a gear vwhose; teethmay. be readily I The-ring B andthe body portion of the adjustedto-cooperatewith.another gear, to compound gear are connectedtogetherbythe compensatefor wear, andthusto'avoidnoise screw bolts D, having screw. threads-d to and also toprolong the-life'of'the gear. ;:My engage inscrew threaded openings in'thebody Y present invention is intended to provide a portion'A, and having heads 03 pe'rforatedas simplificationzoverthe apparatus illustrated at d to permit the use therewith of locking Q and describe'dfin my application filed Novem wires, as will be hereinafter described. i :10 ber16, 1927, Serial #232,692'and entitled These bolt headsd arefprovidediwithsuit- Improvements ingea'rs; 1. 7' able washers E. The bolts D pass f'reely" .My invention will be more fully understood through circular openings bin the ringiB so 1 afterreferenceto the accompanying drawings as to permit the circumferential adjustment 7 in which like lpartsarev indicated by similar of the said ring, as will be hereinaftert'de .15 reference symbols throughout thesev'eral scribed. .e f V views and inwhich 1 5 s 5 Oppositely disposed, screws'FZan d Flare Figure 1. is a side elevation, parts being provided asshown in "Figures v1, land 3, broken: away, to. show my; improvedl'gear which are provided with tapered points)" fmeshing with a driving pinion. 1

p rewith, as'will of the arrows. 1;; U r; I V Y be hereinafter describ'edQ f- Figurev 3, shows a section along theiline" It also provide oppositely disposedadjiist 3 '3 of-Figure 1,"and looking .in the-direction ing screws Hand H"'-generally similar, to .25 ofthe 'arrows, the partsbeingon a somewhat the screws F anjd F just described, one of larger scale than in'Figure 1. 1 which -scr cws-is shown" in detail in Figure 4. Figure 4 shows a section alongithe broken These screws have-conical points 72/ fitting in line HofFigure 1, and-looking in the diconical sockets pl in the body portion A, and I rection of the arrows,'the parts being shown their heads in are-provided withperforations t, h tolpermit thei use of locking wires there-j 8 Figure 5 is'a fragmentary plan view. show; with. Th'escrew bolts andF and bolts ing the manner of. adjustingl'the gear teeth. i H and screw into threads provided "in the Figure-6 is a fragmentary-view showing ring B, and these bolts mo ve with said ring, the'two sets of geartteethin alignment,-and and "have limited play eircumferenti'alrela- ,30into the same scale as Figure 3.

3 Figure 7 is a similar view to 'Figure 6, but tive-to the body portion 'A; while the bolts 35 it shows the same gear teeth afterfadjust'm ent: D screw i'nto body portion A, and the" ring, 7 A represents the main bodyof the gear, B has a limited play over these bolts, whereby l whose periphery is flanged as" at iA' and is the adjustment of the compound gear can be provided'withgearteeth a.f These teeth'are" provided as willnow be desc ibed.-; a

4 shown, as .axially' disposed so that the gear In order to assemble the parts ofthe com- 99-} g I poundgear, the ring B is mounted upon-the The body portion A of thegear is provided cylindrical shoulder a of the-body portion A Wll'jlla'CYlIlHdIlCalLShOlIIC lGI a to engage 'the and-brought. to theposition shownin Figure cylindrical surfac'eoi, the'adjustable member 1". The 'screwbolts D, while resting against can be runbackwards and forwards.

B of the com'poundgear composed of the the edge of the holes I), as shown in Figure two'parts A and B. Y This 'rin'g B is provided 1,-are screwed down tight, and then the lock with a flanged periph'eryfB having; gear ing screws F and F screwed into place, Thus v 1 fittingin' conical. soolietsa". i-The h'ea'dsbt I 1' 20 "Figure 2 shows a section along .theline these-screws F are'perforated as at to per- 9 I I 2-.-.2 ofFigure 1,=and looking in thedirection mit the use of locking wires the teeth 6'. corresponding to the gea 'teetha the-bodyportionjA and ring B" are tightly M of the 'body' portion- A, C represents the locked together against circumferentialmove driving gearaving teeth a meshing-with ment relative to one"anether andarethus L100 set to provide the desired position when the gear teeth can be out upon the two members at the same time.

With the parts so assembled and the teeth tween the gears, but should the adjustment be too tight then loosen the screws H and H",

and screw down on the screws]? and'F', thus".

moving the ring B and teeth I) in the opposite direction-indicated by thearrow L, shown in Figure 1, thus completing the adjustment.

When the proper adjustment is. attained,

first screw down tightly all'the bolts D, then the screws F and F, andfinally the screws H and H. By the-use of locking wires'I shown to theleft-in Figure 1, a sufiicient number or all of the bolts and screws can be locked. The parts remain in this position until. the wear 'of the gearsv renders an adjustment necessary.

To secure such. adjustment, remove the wires I and unscrew'the screwsF andF', and ease up on all the bolts D. Then screw down on the screws H and H until the teeth: are in adjusted alignment.

To secure such-adjustment, ease up on all of the boltsD and on the bolts F and F, and screw down on the bolts H and H until the teeth are in adjusted alignment. It will, be seenvthat the adjustmentin one'direction is controlled by the screws F andF", andin-the opposite direction by the screws H and H; and when the proper adjustment has been finally secured, thescrews are 'set' uptight, and the'parts are securely held against movement in either direction.

Figure 6 is intendedtolshow theteeth in the initial alignment, as when the gear is first put inuse, and Figure 7 isintended to show the teeth in adjusted alignment after there has been an objectionable wear on same.

After the teeth have been put in proper alignment to mesh with the gear C, the locking bolts F and 'F' are screwed 'down tight, and the fastening bolts D are also screwed down tight, then the compound gear isin shape to be used until another adjustment becomes necessary. I

In such adjustments, a. circumferential motion of from-one or two one thousandth of an inch is ordinarily all that is required.

In the form of compound gear illustrated herewith having the body portion; A of greater width incross section than the-ringzB, as shown in Figure 2, it is intendedthat the gear be driven in onlythe one direction ins dicated by the arrow T, althoughit canalso.

be driven in the. opposite. direction. I prefer temake henartsaand' -Biot he.samewidth in cross section for use where it is intended to drive the .gear in either direction.

Where the compound gear is to be initially designed more especially to be driven in the direction indicated by arrow L shown in Figure 1, it is obvious that the parts A and B should'have been placed in the position relative to one. another as that shownin Figure 5,,before the teeth were cut. In this case the screw bolts D, while engaging thediametrically opposite edge of" the hole 6 as shown in Figure 1, will have'been screwed down tight as'likewise the locking screws F and F.

In adjusting the" gear made in this manner 1 the ring B will be caused to move more particularly in the direction indicated by: the arrow L,"shown in Figure 1'. I

By having meshing made, oneof softer ma.- terial than the other, the gear teetharein a large measure preventedfromagetting rough, and excessive noiseis prevented-,andthe life of the gears is prolonged. r i

For this purpose, I. prefer to makeltheidriv ing gear oftempered: steel, andithe ring B and body portion: A of softer material such as soft steel. By the. herein described con-.- struction an extremely nice adjustment between: co-acting. gear teeth is effected, and lost motion between. the. gears. is largely avoided, with. the result that the excessive noise is in a great measureprevented; andthe lifezof the gearsismaterially prolongedi While-l have illustrated anddescribed-one embodiment ofthe invention in its preferred form, it will be obvious that various changes might be made inithe. construction, combination, and arrangement of partsrwhich could be used without. departing from the. spirit of my invention, and I do not meanto limit the invention to. such details except. as particularly pointed out. in the claims;

Having thus described invention,-,what I- claim and desire'toisecurev by Letters Patent of the United States is: p

' An adjustable gear comprising a wheel bodyhaving teeth thereon with a cylindrical shoulder located between the axis of the wheelbody andsaidteeth, andconical sockets provided in theface of said wheel body exterior to said: shoulder, of a ring provided with teeth similar tothose on the wheelbody, said ring being; adapted to slip-over said shoulder, said ring beingfprovided; with internal screw threads registering with said tapered sockets, and: with elongated apertures and, screw bolts passing into saidring and. provided. with tapered. points. engaging in said'sockets, and other screw bolts passing freely through said. elongated apertures and engaging in said wheel. body, whereby the -saidf= ring may: be adjusted and clamped tightly on said wheel body substantially as and. for the, purposes described.

ALEXANDER. MI: ALEXANDBESQU; 

